Created Create document (markdown)

Create-document.md

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+Use the `SVG()` function to create a SVG document within a given html element:
+
+```javascript
+var draw = SVG('canvas').size(300, 300)
+var rect = draw.rect(100, 100).attr({ fill: '#f06' })
+```
+The first argument can either be an id of the element or the selected element itself.
+This will generate the following output:
+
+```html
+<div id="canvas">
+	<svg xmlns="http://www.w3.org/2000/svg" version="1.1" xlink="http://www.w3.org/1999/xlink" width="300" height="300">
+		<rect width="100" height="100" fill="#f06"></rect>
+	</svg>
+</div>
+```
+
+By default the svg canvas follows the dimensions of its parent, in this case `#canvas`:
+
+```javascript
+var draw = SVG('canvas').size('100%', '100%')
+```
+
+## Checking for SVG support
+
+By default this library assumes the client's browser supports SVG. You can test support as follows:
+
+```javascript
+if (SVG.supported) {
+  var draw = SVG('canvas')
+  var rect = draw.rect(100, 100)
+} else {
+  alert('SVG not supported')
+}
+```